Dust collecting system



April 28, 3 L. MITCHELL ETAL 2,636,573

DUST COLLECTING SYSTEM Filed July 13, 1950 /2 Dust laden Gus Dust Product Dust Prpduct INVENTORS Lloyd 1. Mitchell. BY Alfred W. Meyer M 7? Fig. I.

RNEY

Patented Apr. 28, 1953 OFFICE DUST COLLECTING SYSTEM Lloyd I. Mitchell, New Brunswick, and Alfred W. Meyer, Matawan, N. J., assign'ors to National Lead Company, New York, N. Y., a corporation of New Jersey Application July 1a, 1950, Serial No. 173,575

1 Claim.

This invention relates to an apparatus for collecting dust or finely-divided materials. More specifically it relates to an improvement in a dust collecting system. More specifically it relates to a method for automatically removing dust from the walls of a collecting device.

One of the problems involved in dust collecting systems is the difliculty in removing particles from the inside walls of the collector as the dust settles thereupon. Many kinds of devices have been proposed and used for many years. Among these devices are included electrical vibrators, knockers, rappers and hammers. When collecting some types of materials, particularly those containing small amounts of moisture or those which inherently possess sticking qualities, such as for example a titanium dioxide pigment, the old methods generally fall to remove all of the dust from the side walls of the apparatus and in addition the vibrators or hammers are inevitably destructive in their action on the apparatus.

An object of this invention therefore is to provide an apparatus wherein dust or finely-- divided material may be automatically removed from the walls of a dust collecting system. A further object is to provide an apparatus which will remove slightly moist or inherently sticky material from the walls of a collector. These and other objects will become apparent from the following more complete description of the present invention.

Referring now to the drawing, Figure 1 shows a dust collecting system having a centrifugal collector Ill, inlet means ll connecting the collector to a source of dust laden gas l2 and outlet means for removal of the collected dust l3 and the purged gas [4. The improvements in the dust collecting system comprises flexible inlet connector l5 and flexible outlet connectors IE to said centrifugal collector: and in addition the novel resilient mounting means such as spring hangers ll. These maintain the collector in substantially vertical position during the operation of the dust collector. In Figure 2 the dust collector is shown in vibrating motion.

The dust laden gas entering the collecting system at relatively high velocity causes vibrations in the collector apparatus. The vibration is maintained by the gas flow because the collector is resiliently mounted and flexibly connected. The vibration of the collector takes place even if the walls of the collector are made of heavier material than that of the connectors themselves, because of the resilient mounting.

Preferably however the walls of the collector should be of a material which has sufiicient resiliency to permit the walls themselves to vibrate under the conditions of gas flow therethrough. This resilient or thin walled collector is particularly useful for extremely sticky types of materials. It is also to be understood that if the walls of the collector themselves are of a resiliency capable of vibrating under the conditions of gas flow therethrough, the connectors may form an integral part of the collector without resorting to separate flexible connectors.

The flexible connectors shown in Figure 1 are illustrated as bellows-type thin walled metal sleeves. This is an effective type of connector but many other types of flexible connectors may be equally and satisfactorily used.

When this device is used for the collection of finely divided pigments for example it is preferred to have the walls of the collector of a material of a thinness capable of vibrating themselves under the conditions of gas flow therethrough. The gas entering the centrifugal collector sets up a turbulent flow in the collector and the thin walled material and the flexible connections set up a vibration in the entire dust collector which prevents the solid particles from collecting on the inside walls of the container. The solid particles fall to the bottom of the dust collector and are removed through outlet I3. The purged gases are removed through outlet ]4 at the top of the du-J't collector. The dust collector being resiliently mounted sets up a vibration which allows the collection of solid material from dust laden gases to be collected continuously without frequent periodic cleaning of the collector.

On an apparatus requiring insulation it is easier to retain insulation on the outer walls of this type of collector than on other types because of the less destructive nature of the vibration of the collector walls.

The apparatus is easy to install and has sub stantially low maintenance requirements. It is more satisfactory in preventing build up of finely divided material on the Walls of the collector than any of the prior art methods and devices used for this purpose. In addition this apparatus is free from hammers, rappers, knockers and the like, which makes upkeep simple and economical.

While this invention has been described and illustrated by the examples shown, it is not intended to be strictly limited thereto and other modifications and variations maybe employed within the scope of the following claim.

We claim:

In a dust collecting system embodying a source of adherent-dust laden gas and including conduit means through which said adherent-dust laden gas is propelled at high velocities, the combination including: a vibratory centrifugal collector for separating said adherent-dust from said gas, :said collector having thin metal exterior walls constructed and arranged to be vibrated at high frequencies by entry of said high velocity adherent-dust laden gas into said centrifugal collector, thereby to dislodge the adherent-dust from said metal exterior walls; entry means eX- tending substantially transversely from said centrifugal collector including a bellows sleeve connection arranged to connect said centrifugal collector to said conduit means to deliver said .adherent-dust laden gas into said collector; outlet means on said centrifugal collector including flexible connections arranged to remove the separated adherent-dust and the purged gas respectively from said centrifugal collector; and resilient hanger means secured to the upper end only of said centrifugal collector and arranged to suspend said collector in a substantially vertical position in space to permit high frequency vibration of said metal exterior walls in directions both longitudinally and transversely of the longitudinal axis of said collector.

LLOYD I.

ALFRED W. MEYER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,077,358 McDevitt NOV. 4, 1913 2,115,134 Andersen Apr. 26, 1938 2,242,277 Yonkers May 20, 1941 2,253,310 'Smellie Aug. 19, 1941 2,293,113 Carney Aug. 18, 1942 2,438,827 Shofiner Mar. 30, 1948 2,463,435 Smellie Mar. 1, 1949 "2,508,113 Andersen May 16, 1950 

